null value

I have a application in visual basic with access as backend
In the form if I take value for any text box and save it in the database
And next time while editing if I try to make it null and save it
Next time I get the error invalid use of null although I have checked for no values required
In the access and default value to &#8220;&#8221;

It sounds as if you are succcessfully reading a null value from the database and then trying to do something with it in VB that cannot be done with a Null.
You'll need to test for null before you use it.

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